| 摘要 |
A method and a device for manufacturing a tubular object from a thermoplastic material are provided to form a wall of the tubular object adjustable in thickness by controlling a speed profile for moving a withdrawal unit and a plunger. A die(4) has a die land(12) and a die body(14). An annular die opening is formed between the die land and the die body. The die body is moved relative to the die land to change a section of the die opening. An extruding device(2) has a plunger(10) extruding the plasticized plastic material determined by a plunger path through the die. The withdrawal unit has a path determining the length of the plastic material. The control unit controls the movement of the die body, the plunger, and the withdrawal unit. The movements of the withdrawal unit and the plunger are controlled according to the adjustable speed profile. The movement of the die body is controlled according to the adjustable position profile on the withdrawal unit or the plunger.
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